/*

<This Java Class is part of the jMusic API version 1.5, March 2004.>

Copyright (C) 2000 Andrew Sorensen & Andrew Brown

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or any
later version.

This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

package jm.audio.synth;

import jm.audio.AOException;
import jm.audio.AudioObject;

/**
 * @author Andrew Sorensen
 * @version 1.0, Sun Feb 25 18:42:51  2001
 */

public final class Window extends AudioObject {
    //----------------------------------------------
    // Attributes
    //----------------------------------------------
    /**
     * algorithm to use for the window
     */
    private int type;
    /**
     * is this window the input or output
     */
    private boolean direction;

    //----------------------------------------------
    // Constructors
    //----------------------------------------------

    /**
     * @param outputs the number of outputs to support.
     * @param ao      the single AudioObject taken as input.
     */
    public Window(AudioObject ao, int type, boolean direction) {
        super(ao, "[Window]");
        this.type = type;
        this.direction = direction;
    }

    //----------------------------------------------
    // Public Methods
    //----------------------------------------------

    //----------------------------------------------
    // Protected Methods
    //----------------------------------------------

    /**
     */
    public int work(float[] buffer) throws AOException {
        int returned = this.previous[0].nextWork(buffer);
        if (direction) {
            for (int i = 0; i < returned; i++) {
                buffer[i] = buffer[i] * (float) (Math.sin(Math.PI * i / returned));
            }
        } else {
            for (int i = 0; i < returned; i++) {
                buffer[i] = buffer[i] / (float) (Math.sin(Math.PI * i / returned));
            }
        }
        return returned;
    }
}
